LAUSR

Abstract Three-dimensional (3D) hierarchical α-NiMoO 4 @δ-MnO 2 core-shell hybrid nanorods/nanosheets are fabricated directly on Ni foam via a two-step approach which involves hydrothermal and one-pot chelation-mediated aqueous processes. The α-NiMoO 4 nanorods are full covered by ultrathin δ-MnO 2 nanosheets and the morphological evolution process of α-NiMoO 4 @δ-MnO 2 electrode has been investigated by scanning electron microscopy (SEM) at different time intervals. When this hybrid, along with porous Ni foam, is employed as binder-free electrode for supercapacitors, exhibiting high capacitance of 1136 F g −1 at a current density of 2 A g −1 and super-long cycling life with 101.9% retention rate after 5000 cyclic voltammetry cycles, which are much better than the single α-NiMoO 4 nanorod electrode. Moreover, according to the electrochemical impedance spectroscopy (EIS) analysis, it is found that the equivalent series resistance (R s ) and charge transfer resistance (R ct ) of the hybrid electrode are 0.22 Ω and 4.03 Ω, respectively. In view of the outstanding electrochemical performance and the cost-effective fabrication process, this unique integrated nanoarchitecture would hold great promise for electrochemical energy storage.